how to check whether the ssh tunnel is up

[Gert Doering]

Hi,

On Thu, May 16, 2013 at 04:15:07PM +0800, Vincent Lin wrote:
> OK, I got it, all I want is to know the remote socket is ready so that the
> server side can wirte data. I will leave the rest part to the server side.
> I don't care whether the ssh tunnel is successful or not. And I can't know
> that. The server side should take care of that tunnel.

You actually can't know whether the remote socket is ready for *you* 
without checking the full path back to you - some other user on the
remote machine might already have opened the specific remote forwarding
port before...

gert
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Gert Doering - Munich, Germany                             gert at greenie.muc.de
fax: +49-89-35655025                        gert at net.informatik.tu-muenchen.de